EP 0782544 B1 20010829 - METHOD FOR PURIFYING SODIUM ALUMINATE SOLUTIONS CONTAINING SODIUM OXALATE
Title (en)
METHOD FOR PURIFYING SODIUM ALUMINATE SOLUTIONS CONTAINING SODIUM OXALATE
Title (de)
FLÜSSIGE REINIGUNGSZUSAMMENSETZUNG
Title (fr)
PROCEDE D'EPURATION DES SOLUTIONS D'ALUMINATE DE SODIUM CONTENANT DE L'OXALATE DE SODIUM
Publication
Application
Priority
- FR 9601104 W 19960716
- FR 9509040 A 19950720
Abstract (en)
[origin: FR2736908A1] A method for removing sodium oxalate from sodium aluminate solutions produced by alkaline bauxite treatment according to the Bayer process, wherein the sodium oxalate in at least one fraction of the previously decomposed sodium aluminate solution is precipitated using an agent that destabilises the supersaturated state of the sodium oxalate, i.e. a deoxalation initiator, and the oxalate, precipitated with the destabilising agent in the form of an insoluble residue is separated from the purified sodium aluminate solution which is then recycled as the treatment liquor. The destabilising agent or deoxalation initiator contacted with the sodium aluminate solution is a salt other than an oxalate, a metal oxide, a metal hydroxide or a mixture thereof, said destabilising agent remains insoluble in or chemically inert to the reaction medium, and following an optional regeneration step, said agent is recycled to the start of the process as a deoxalation initiator.
IPC 1-7
IPC 8 full level
C01F 7/473 (2022.01)
CPC (source: EP US)
C01F 7/473 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GR IE IT
DOCDB simple family (publication)
US 5888461 A 19990330; AU 6617996 A 19970218; AU 700993 B2 19990114; BR 9606529 A 19971014; CA 2199059 A1 19970206; CA 2199059 C 20081014; DE 69614818 D1 20011004; DE 69614818 T2 20020404; EP 0782544 A1 19970709; EP 0782544 B1 20010829; ES 2161369 T3 20011201; FR 2736908 A1 19970124; FR 2736908 B1 19970829; HU 220533 B1 20020328; HU P9702302 A2 19980828; HU P9702302 A3 19981228; OA 10405 A 20011205; WO 9703924 A1 19970206
DOCDB simple family (application)
US 68596096 A 19960722; AU 6617996 A 19960716; BR 9606529 A 19960716; CA 2199059 A 19960716; DE 69614818 T 19960716; EP 96925792 A 19960716; ES 96925792 T 19960716; FR 9509040 A 19950720; FR 9601104 W 19960716; HU P9702302 A 19960716; OA 60976 A 19970319